December 15, 2012
Breaking down a key play

San Francisco 49ers quarterback Colin Kaepernick (L) is escorted into the end zone by teammate Delanie Walker while scoring on a 50-yard run against the Miami Dolphins during the fourth quarter of their NFL football game in San Francisco, California December 9, 2012. (REUTERS/Robert Galbraith)

Perhaps the primary reason the San Francisco 49ers switched starting quarterbacks last month is that Colin Kaepernick provides more of a downfield passing threat than his predecessor, Alex Smith.

Another reason is that Kaepernick can make dazzling plays with his feet. Case in point, last Sunday in Miami.

The situation:

The 49ers lead the Dolphins 20-13 with 2:20 remaining, and San Francisco has the ball 3rd-and-5 at midfield. The Niners come out in a robust package in the pistol – with three tight ends, one running back and only one wide receiver, flanked left.